dotnet-core/release-notes/2.1/Preview/api-diff/preview1/2.1-preview1_System.Net.md

System.Net

 namespace System.Net {
     public class IPAddress {
+        public IPAddress(ReadOnlySpan<byte> address);
+        public IPAddress(ReadOnlySpan<byte> address, long scopeid);
+        public static IPAddress Parse(ReadOnlySpan<char> ipString);
+        public bool TryFormat(Span<char> destination, out int charsWritten);
+        public static bool TryParse(ReadOnlySpan<char> ipString, out IPAddress address);
+        public bool TryWriteBytes(Span<byte> destination, out int bytesWritten);
     }
 }